I'll go with SC's top three, but flip-flop Dylan with Lieber & Stoller. Dylan gets the nod based on the profundity of his work. Quite simply, he's a poet like no other and certainly the greatest American poet of our time, if not all time. Lieber & Stoller's work was a bit more of the simplistic "pop" variety.

All three make it for me based on quantity as well as quality. Past them, the rest of the list is a toss-up.

After Bruce and before Billy Joel, who I'm not sure belogs on the list, I might throw in Bernie Taupin, Elton John's long-time lyricist, and Brian Wilson and his Beach Boys collaborators.